@article {1431,
	title = {Fertile coniferophyte remains from the Late Triassic Deep River Basin, north Carolina},
	journal = {American Journal of Botany},
	volume = {60},
	year = {1973},
	pages = {810-818},
	url = {http://www.jstor.org/pss/2441174},
	author = {Delevoryas, Theodore and Hope, R.C.}
}
@article {1056,
	title = {A new Voltzialean cone bearing seeds with embryos from the Permian of Texas},
	journal = {American Journal of Botany},
	volume = {60},
	year = {1973},
	pages = {569},
	chapter = {561},
	author = {Miller, Charles N., Jr. and Brown, John Thomas}
}
@article {574,
	title = {Masculostrobus acuminatum nom nov., un nouvel organe reproducteur male de gymnosperme du Gr{\`e}s {\`a} Voltzia (Trias Inferieur) des Vosges (France)},
	journal = {G{\'e}obios},
	volume = {6},
	year = {1973},
	pages = {101-114},
	chapter = {101},
	author = {Grauvogel-Stamm, L. and Grauvogel, L.}
}
